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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47bcc5e0384e2888d145dfd2fc31ffdc3920cb6fd08a262bae89bbe0eefc7a27' 
  AND token = 'tv3Bz0VZ2LtkClb+Jwn/g95h/eDtIgnCZXfXnxS9IeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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