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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391d1e12e59d4541e624e3c4bd82469f788bc070a2d3bc3c5655a0a517fdf69e' 
  AND token = 'WQCXxL37DGaCInV10o+ey2dTN+Pg23BSkETUEA3toFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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