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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f323bebdd858c286b5594f9e34636db15c4013d25984265a458cf7fd7f9138bb' 
  AND token = '3xG/EUoC60F+F6LqcVLQ7jFYn12XmroeC3n2ufAbkOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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