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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d39233707eab4baf38180b3a813c8d2748a25665312ba9e2ed38fccf1c4dd6' 
  AND token = 'iTdcV2jnImZ1GznFz4vw0AWP53T29epSlb3rRpU9OHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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