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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744cee2b7227c4efb0bab87d5d1b5f0f21f96bbdd01824ac81b6921b2ffb5ef7' 
  AND token = 'KBstwyxn5hJNa3BLU8tSjVgcLfK4xj98nPmMrZ7JR74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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