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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1a7396d3962167c5ec4a08def94ae687349191c45f43c42a6bb19427f2b844' 
  AND token = 'A7Ya1RIGV3BnJdtUc81+FX855f1Nln5z3Lyqm8GD5wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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