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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee284198333e088521e7f2c048c4edf46dc2c4cce1322e2bb55d6244ea7794b' 
  AND token = 'wDM6RZ0JsY4tufcF6toRUP4tLymXaAE0IbI0Ec7naJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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