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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22b7036c73d53010859dbffdccc7945557487aa3ed68af92f32ee3da86b9d98' 
  AND token = 'plGWUNjJ5ED4Jd90CkamFAIag8WcRNsgQcCrs1+pp+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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