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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef32b9830b09e0c0dd804ece47d1d978e6d771e32373b84ecbbb61317b247930' 
  AND token = 'YqkBNCxc2pQD/5HK16IOM0Dgx/HhfUmQLqu7Qfa3nfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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