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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f110e5b8836734019f0ccc415a39a0d51c4d33cdc9a53479b66a90ab52763d8' 
  AND token = 'EYsT21J23C1IYq5x3z0GluVDo/2w7a4WSwXLL1A8aUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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