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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28d072851b5db3e221ad5fb7edd5eaa29b630bf9261724f94c22018e8336802' 
  AND token = '3KTCmEdvUH2RQAXAaRJX7Y2b8vquwBQ/c12uoEaooC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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