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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7ea16a3af979e499c8deb8349633fdcd7e98f56616d23e7b0f4c9f60c58c13a' 
  AND token = 'Ntt4QT8zlANA3xUcCtzWlG0NlMkpiQiZA3cnWVVY8vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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