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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cedae80002d1f2300e13cd67d6a7e7ab1be89acf6a2c26c19e42edc03648182' 
  AND token = 'GAHfZQCAWTgeZinx1VFVoDneiFw0tTHnTAKRV/ezc4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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