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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4a7cdd0b90399c3dccb219cc1c0b3689658ddcb768c746be1b5729572b8926' 
  AND token = 'G77SxvvSrS9w0T7vXoiAtZErop0x5TdAjykUks5nqR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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