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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb182f55e33ca1764a9a3d2cbe8bb86543ef39ec616eb49273b1fc40e7d41c20' 
  AND token = 'gFnanLDl4ZQ/KX08JbTSS94UPFByGvxNZSOhkX1dlmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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