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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa138b04c368e93aa09d790960d3340ec11d8ff69662efb693a721c776640ac' 
  AND token = 'I2j8oBJB8b8x6zvszmOcRejSDpqXs9/5BLQ81KT9Orc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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