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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a92a173b6a04e3f36788337940b31493f0f38d557e0594d66c2cd2de61aba28' 
  AND token = '+s8V9G8pQc/R1PvfQZ2xGc7Lc8ex0ODIffAGx6B6hXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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