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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0940c54b2df31ab5bc074609e49a722404cd8437d3be5db84777756b21564d' 
  AND token = 'WXPwdRZYTGdjMNNc7LJWfkSZSq3eV2cbotTN204KzM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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