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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bd565bceab319916e995ffca95858e731d34a289f3fe96e4eeda8350460c6df' 
  AND token = 'Jk3q8brmQhkBW/l+eadhNBN63WYG306HmzEMHuxnvuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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