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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff6871888720a145a9c60713f43ac6e078cdcf70df78b898e863a4a3fe7222a' 
  AND token = 'cdqjya8OhR+E0cn948ZQyxCtcah80XtKbBoKzlKC5Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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