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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3607a71ac62cd28e38c096690c238cfc5f03e3e5921f88806057f4a5867f11c' 
  AND token = 'r6TgqEhqfDe9WST9LiPqNjTruDrEZX8p6Z9ExiSQ93E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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