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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dab3458e6901a4eb19ca681e2b34f5b892f2dad682d7d83d658df90ea2485d' 
  AND token = 'yKi1RKau6boqtKvld2uMNS/sgIpNFvUCfzd/9qmfWeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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