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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551dc97893a6c2d7741d2ff1886bc58ac24db946b27c62d8bf7519d861734ee8' 
  AND token = '/Mm4rfQQA2bAiLoalHALESHHOCNOYTOOTdFB4yFoVLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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