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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1527ecc15049ac25f56632f703678296d5f9e0f07f2c432814b9574edd697d9e' 
  AND token = 'fVFwIxCOaQMlID4tJCJjD7yVEFQvVpeAjP2CjEP8qAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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