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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905c581229444dfda71d0bd97a31eaa567e19a1e1402a2a5248828d261e68698' 
  AND token = 'HeOIDDOzqf3qXEnfi3FKuY1zBfuLQO3WiiZp3j2lBEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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