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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0403f736800f55900238c0ae591dc9c10b89856bf096921bb6b0098643177cf' 
  AND token = '1LHh618QLT70NN1UCdv6fZ2dRnCbPsfJHmazFF1seD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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