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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8ed22c226a9f6081820c421cb2774e2e50b41f6ae65e00c2c65c45323f92e9' 
  AND token = 'uz8eCSPraBO28pbSZd8TA7Xak/kB7s0HIcpL0oUbhhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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