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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2f8b802d44eede4615a47be4c30d9df0de2c82066bd0666b6720764db62249' 
  AND token = 'l7aR1ybErCxOAuKCBw2P9BeZm3Q+jm49So9MAMRIqUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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