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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789282fc0142010ed393c44222913ff4cc38943625f6ac7aedbdd80dbfb383fc' 
  AND token = 'uq5J8dS4Lp7nib4Npv4mXyYytwjW0pRjOeE3L8rhcdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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