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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ea3342c6f618b8b80c737746504d14c70be66721c41bece72257945dd8e3b96' 
  AND token = 'h4Ky5xwsQHLRmwiFopgAM8c5xM5AAJ6JtR5pHd1UE4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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