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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9297e07644b4b0675b51dd785ca868076e2d763c2c72f029c916bdc90f02ef4a' 
  AND token = 'WPxb5rYLZ1FjtVZMmdzK2eSCJkEIYtEZ8fMtL8Jx1HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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