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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709b96b5710ed4bbefb6350ea279745ab0afa380d2f3db00c991665cb51426f4' 
  AND token = 't6x3v0eUxIBHH8k04v+PShX03rcSP803YFMM7VlIoZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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