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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0c93b1a52358014ad223f25b19e3c2c78252f30e3597eef05e23a6e1d93c60' 
  AND token = 'gXNGUJ6qsk4tKY8iNodqO3DWX0r0Sw9vSXcLSx07c7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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