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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3a12a5473cf64a988b4a6d2aba8d277c1542a8ebaa47dc24da6744f4bff706' 
  AND token = 'UrkCYBV3oE7cbI7pP3m8Vy6XrELTwbEWl5Ynubr6fIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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