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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd2b24cde1f846677ec5655f271bdaec7b0919e9f980ea52b040b93c28d7637a' 
  AND token = '6mauM28VtkODbPCPzwMSf6MprjTlmIT7/kMCUqHb8tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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