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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a18f40c8e6efb63bb10e3dc4ed8b79ecf46fb2c90e7a73ff631cf839b70829b7' 
  AND token = 'wKkYfNKhzSKi+F9a1AX70SLW0ubCt+BJGF5MpF7jEus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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