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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2800f5fe92192f9f83095de84689fda3350f9ec814700648dd40d900f490e63d' 
  AND token = '2uXb+L1E3bv9rJls3uTnsACOBLtA2Dqg2iqzmbHe650=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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