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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8943ece37f10d37bc3b084a84f0ec5713ef1139f57951f4e31e20dde38463027' 
  AND token = 'I2/rxl6vBHMDMqOLWe08JYhd9LWw2qqCjTfQ1nJTH1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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