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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2f0e59a62bc9781d51d9db17ee3dc2827a2fdb294d9fdb17bb8f22110ac3481' 
  AND token = '4iwitHvy4xc+B+vMuCx/54u90TaqqYv8OzFuKxLtGXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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