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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91ceea79ca079af9122d3267b653e451d7d86605fa8cd8a6858a85f66797f9a' 
  AND token = 'jokisSlixj2182rP2iy6093Jf3GUvH7Jzmq61ZINMIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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