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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c8a3ca5f88889777a1c44434f4eac02515bb87401fd8b99bce36809ca8be2a' 
  AND token = 'ewLg5BLHlI8x1SYUu52FtnumltMGT48mFb7jrKoyNMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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