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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2fdde5732bc288f469be475abf4e1284a25b17a44f474d69c43783303078da0' 
  AND token = 'H3h4heq2HqsLVrVHVbT3xY26LSVMA0D36SAPEk4z3Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}