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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd151914ea7aea97f0d86605cb121127228c6ea80d47a96922b1ea5a71b378f' 
  AND token = 'TQ2sha3WlXzMfy1B3LNwqpxcV43fTif06IqfD9yNhoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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