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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b27a193fcef27ea4a431033117a6bbab0bb26366aed8c37c9b54c196a0a1ad' 
  AND token = 'igan2C7bfO34j9aXqX8nAmf8pposGvAIOp+0js4v90w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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