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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a077b207e6bd4721626ac5364c38d89a416cdcab132983021486d89f074f786' 
  AND token = 'mzO7vsD65fDOQIf9d+ZW72QCPZdtd4IL/UcyQ5vUUMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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