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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cbb948d0b5f265c14a91b4ba6352a109b885731c7aef69f35a5de8d281f2c7' 
  AND token = '62dF/aHl8J1YDmzRveQHHgceU5ExwoOwgmoVV9gHUMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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