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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf33b6d963f38bdc671abc952762ac5792d7b8f0d864dcac932838afceb5fc82' 
  AND token = 'o3wCZNfcE03IcTnOlT/93DMwDJIkVJITll4zYju2LM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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