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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eaea589b75d17f43589c686684e5a3384a5f8f3841920bd8441475d35448b9d' 
  AND token = 'jjZey7//Le9BWXi24TtzSIF8JDBl0x4GQkyc2HAmU9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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