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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd05925903444151762f76b58eb87f2856186b2d7bedf00c72adabd83c26a9790' 
  AND token = '7733A/A62wjnqVKBgFSuQ9nOAMM78/Qh/xbSfZAg6Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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