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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c23fff29f3fa0c3ebfce64cd80bf4602420a02a202684c888b0fa169b3b825' 
  AND token = '9wxoI/eiaM2E5SCVviAJ863ORJVCAKFokAbIm4k4jk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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