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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3716f13453bae1fcd5a3415bf8a6b06770d0310078687057559dbdbb3ca5d8' 
  AND token = 'KHLLWyolNcGSf5XU8tNgc2jsm/l7mHhq1fDi4XNcsgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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