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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a18653ebfaee32facfe574baa9b52e5dd85ec2518e6dfc5fb46ee1404c42ce' 
  AND token = '6fjxcnQ8E06bjKoXFPePIrX9eQxMgF1YVXi9x95RhLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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