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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2212ec5caee3163ac6c72ae0171bf3055d44335cea4f2da5fb53375b09b80234' 
  AND token = 'txGyWTVgMxjOMsTawIbqNcBmnRwV2TbxEEp8PZZA8s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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