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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b3ff53cf4f9c77ad0747d29f4d64b249f51d8a1ed12dae154903ba6b0f92ca' 
  AND token = 'J/n+FLEMnNgdLuJKsuCi3QrUcZllPah7TMb07mcpoAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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